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Help with a loose crank

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cogman Offline
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Posts: 14
Joined: Apr 2011
Post: #1
Help with a loose crank
Hey guys, I just finished my exams (Im a student) and now I can finally spend some time fixing my bike Tongue, I realised that the crank is loose when I ride, how do I stop this from wobbling?

Here are some pictures of my bike...
http://i580.photobucket.com/albums/ss247/cogman12345/DSC00573.jpg
http://i580.photobucket.com/albums/ss247/cogman12345/DSC00574.jpg
http://i580.photobucket.com/albums/ss247/cogman12345/DSC00575-1.jpg

Btw, there was originally a cap thingy on the otherside of the bicycle similar to the other side, It fell off when I was riding hehe

Thanks for your help Big Grin
Jun 18, 2011 10:58 AM
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nfmisso Offline
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San Jose, CA
Posts: 2,332
Joined: Jul 2010
Post: #2
RE: Help with a loose crank
A 14mm socket is needed to tighten the nut; like this one: http://www.amazon.com/Wera-Zyklop-8790-Socket-Length/dp/B003GDIRB2/ and a wrench like this: http://www.amazon.com/8-Inch-Drive-Socket-Wrench-Breaker/dp/B002GQ8K6W/

but get a set if you don't have a metric set; like this:
http://www.amazon.com/Craftsman-9-34740-Standard-Metric-Socket/dp/B00065SZTC/

Snap On is the best, and very expensive. S-K and Craftsman are excellent too. For the casual user much cheaper socket set will usually be okay. I have a mixture of Craftsman and cheapies from Harbor Frieght.

Nigel
Jun 18, 2011 03:33 PM
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cogman Offline
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Posts: 14
Joined: Apr 2011
Post: #3
RE: Help with a loose crank
(Jun 18, 2011 03:33 PM)nfmisso Wrote:  A 14mm socket is needed to tighten the nut; like this one: http://www.amazon.com/Wera-Zyklop-8790-Socket-Length/dp/B003GDIRB2/ and a wrench like this: http://www.amazon.com/8-Inch-Drive-Socket-Wrench-Breaker/dp/B002GQ8K6W/

but get a set if you don't have a metric set; like this:
http://www.amazon.com/Craftsman-9-34740-Standard-Metric-Socket/dp/B00065SZTC/

Snap On is the best, and very expensive. S-K and Craftsman are excellent too. For the casual user much cheaper socket set will usually be okay. I have a mixture of Craftsman and cheapies from Harbor Frieght.


http://cgi.ebay.co.uk/Cyclepro-Crank-Extractor-Cycle-Bike-Pedal-Arm-Remover-/220718284002?_trksid=p5197.m7&_trkparms=algo%3DLVI%26itu%3DUCI%26otn%3D5%26po%3DLVI%26ps%3D63%26clkid%3D754711162428486839#ht_826w​t_883


Would this be fine?, So all I have to do is tighten the nut right?
Jun 19, 2011 04:06 AM
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nfmisso Offline
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San Jose, CA
Posts: 2,332
Joined: Jul 2010
Post: #4
RE: Help with a loose crank
yes; if you have wrench to turn it with. That includes a tool for removing as well as tightening. But no wrench to turn it with.

I have one of these: http://www.amazon.com/Filzer-Crank-Multi-Tool-CMT-1/dp/B004FOG1AU/

But always use standard socket and ratchet to tighten the cranks as it is faster.

Nigel
Jun 19, 2011 07:51 AM
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cogman Offline
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Posts: 14
Joined: Apr 2011
Post: #5
RE: Help with a loose crank
(Jun 19, 2011 07:51 AM)nfmisso Wrote:  yes; if you have wrench to turn it with. That includes a tool for removing as well as tightening. But no wrench to turn it with.

I have one of these: http://www.amazon.com/Filzer-Crank-Multi-Tool-CMT-1/dp/B004FOG1AU/

But always use standard socket and ratchet to tighten the cranks as it is faster.

Ahh I see, Well Ive ordered the product from ebay due to a shortage of money, and I was wondering do you think I could use an adjustable wrench to turn the bolt?.

something like this..http://www.amazon.co.uk/dp/B000LFTQUY/ref=asc_df_B000LFTQUY3357670?smid=A3P5ROKL5A1OLE&tag=googlecouk06-21&linkCode=asn&creative=22206&creativeASIN=B000LFTQUY

Cheers.
Jun 26, 2011 06:25 AM
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nfmisso Offline
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San Jose, CA
Posts: 2,332
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Post: #6
RE: Help with a loose crank
(Jun 26, 2011 06:25 AM)cogman Wrote:  
(Jun 19, 2011 07:51 AM)nfmisso Wrote:  yes; if you have wrench to turn it with. That includes a tool for removing as well as tightening. But no wrench to turn it with.

I have one of these: http://www.amazon.com/Filzer-Crank-Multi-Tool-CMT-1/dp/B004FOG1AU/

But always use standard socket and ratchet to tighten the cranks as it is faster.

Ahh I see, Well Ive ordered the product from ebay due to a shortage of money, and I was wondering do you think I could use an adjustable wrench to turn the bolt?.

something like this..http://www.amazon.co.uk/dp/B000LFTQUY/ref=asc_df_B000LFTQUY3357670?smid=A3P5ROKL5A1OLE&tag=googlecouk06-21&linkCode=asn&creative=22206&creativeASIN=B000LFTQUY

Cheers.

Should work, just take a long time... make sure you remove the bolt or nut holding on the crank arm. Take the tool apart, thread the part on to the arm all the way, then install the center piece, and turn slowly until the arm is pushed off.

The reason for taking the tool apart is to reduce the risk of cross threading; which if it happens, you'll need a gear puller or similar to get the crank arm off without damage to the bottom bracket. If you don't care about the bottom bracket, and lever will get the crank arm off.

Nigel
Jun 26, 2011 07:24 AM
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cogman Offline
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Posts: 14
Joined: Apr 2011
Post: #7
RE: Help with a loose crank
(Jun 26, 2011 07:24 AM)nfmisso Wrote:  
(Jun 26, 2011 06:25 AM)cogman Wrote:  
(Jun 19, 2011 07:51 AM)nfmisso Wrote:  yes; if you have wrench to turn it with. That includes a tool for removing as well as tightening. But no wrench to turn it with.

I have one of these: http://www.amazon.com/Filzer-Crank-Multi-Tool-CMT-1/dp/B004FOG1AU/

But always use standard socket and ratchet to tighten the cranks as it is faster.

Ahh I see, Well Ive ordered the product from ebay due to a shortage of money, and I was wondering do you think I could use an adjustable wrench to turn the bolt?.

something like this..http://www.amazon.co.uk/dp/B000LFTQUY/ref=asc_df_B000LFTQUY3357670?smid=A3P5ROKL5A1OLE&tag=googlecouk06-21&linkCode=asn&creative=22206&creativeASIN=B000LFTQUY

Cheers.

Should work, just take a long time... make sure you remove the bolt or nut holding on the crank arm. Take the tool apart, thread the part on to the arm all the way, then install the center piece, and turn slowly until the arm is pushed off.

The reason for taking the tool apart is to reduce the risk of cross threading; which if it happens, you'll need a gear puller or similar to get the crank arm off without damage to the bottom bracket. If you don't care about the bottom bracket, and lever will get the crank arm off.


I thought I was only tightening the bolt? , Are you suggesting to remove the whole crank ? :O
Jun 26, 2011 10:18 AM
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cyclerUK Offline
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Posts: 753
Joined: Jan 2009
Post: #8
RE: Help with a loose crank
(Jun 19, 2011 04:06 AM)cogman Wrote:  
(Jun 18, 2011 03:33 PM)nfmisso Wrote:  A 14mm socket is needed to tighten the nut; like this one: http://www.amazon.com/Wera-Zyklop-8790-Socket-Length/dp/B003GDIRB2/ and a wrench like this: http://www.amazon.com/8-Inch-Drive-Socket-Wrench-Breaker/dp/B002GQ8K6W/

but get a set if you don't have a metric set; like this:
http://www.amazon.com/Craftsman-9-34740-Standard-Metric-Socket/dp/B00065SZTC/

Snap On is the best, and very expensive. S-K and Craftsman are excellent too. For the casual user much cheaper socket set will usually be okay. I have a mixture of Craftsman and cheapies from Harbor Frieght.


http://cgi.ebay.co.uk/Cyclepro-Crank-Extractor-Cycle-Bike-Pedal-Arm-Remover-/220718284002?_trksid=p5197.m7&_trkparms=algo%3DLVI%26itu%3DUCI%26otn%3D5%26po%3DLVI%26ps%3D63%26clkid%3D754711162428486839#ht_826w​t_883


Would this be fine?, So all I have to do is tighten the nut right?

This tool can be used to remove and also tighten when putting back on.
I would remove the crank-arm, clean and very lightly grease the crank.
Replace arm and tighten.
This tool will still need a wrench as well.

Ride hard or ride home alone!
Jun 26, 2011 10:35 AM
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nfmisso Offline
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San Jose, CA
Posts: 2,332
Joined: Jul 2010
Post: #9
RE: Help with a loose crank
(Jun 26, 2011 10:35 AM)cyclerUK Wrote:  .....
This tool can be used to remove and also tighten when putting back on.
I would remove the crank-arm, clean and very lightly grease the crank.
Replace arm and tighten.
This tool will still need a wrench as well.

+1

Nigel
Jun 26, 2011 12:41 PM
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cogman Offline
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Posts: 14
Joined: Apr 2011
Post: #10
RE: Help with a loose crank
(Jun 26, 2011 10:35 AM)cyclerUK Wrote:  
(Jun 19, 2011 04:06 AM)cogman Wrote:  
(Jun 18, 2011 03:33 PM)nfmisso Wrote:  A 14mm socket is needed to tighten the nut; like this one: http://www.amazon.com/Wera-Zyklop-8790-Socket-Length/dp/B003GDIRB2/ and a wrench like this: http://www.amazon.com/8-Inch-Drive-Socket-Wrench-Breaker/dp/B002GQ8K6W/

but get a set if you don't have a metric set; like this:
http://www.amazon.com/Craftsman-9-34740-Standard-Metric-Socket/dp/B00065SZTC/

Snap On is the best, and very expensive. S-K and Craftsman are excellent too. For the casual user much cheaper socket set will usually be okay. I have a mixture of Craftsman and cheapies from Harbor Frieght.


http://cgi.ebay.co.uk/Cyclepro-Crank-Extractor-Cycle-Bike-Pedal-Arm-Remover-/220718284002?_trksid=p5197.m7&_trkparms=algo%3DLVI%26itu%3DUCI%26otn%3D5%26po%3DLVI%26ps%3D63%26clkid%3D754711162428486839#ht_826w​t_883


Would this be fine?, So all I have to do is tighten the nut right?

This tool can be used to remove and also tighten when putting back on.
I would remove the crank-arm, clean and very lightly grease the crank.
Replace arm and tighten.
This tool will still need a wrench as well.


Sorry to be difficult, but is it just possible just to tighten the bolt on its own without removing the whole crank?
Jun 26, 2011 12:56 PM
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nfmisso Offline
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San Jose, CA
Posts: 2,332
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Post: #11
RE: Help with a loose crank
(Jun 26, 2011 12:56 PM)cogman Wrote:  Sorry to be difficult, but is it just possible just to tighten the bolt on its own without removing the whole crank?

maybe, maybe not. It is not worth it to do so.

Bottom line, riding around on it loose may have trashed the crank, and you may never be able to tighten it properly. If that did occur, you can sometimes salvage it with a shim (a layer of aluminum foil) on one of the faces.

Nigel
Jun 26, 2011 05:31 PM
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cyclerUK Offline
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Posts: 753
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Post: #12
RE: Help with a loose crank
[/quote] Sorry to be difficult, but is it just possible just to tighten the bolt on its own without removing the whole crank?
[/quote]

Basically Yes.
But I would remove the bolt and make sure there is a washer under it.
If the crank is loose then it may come off with a tug anyway?
You still need a good socket / tool to tighten the bolt though.

Ride hard or ride home alone!
Jun 27, 2011 01:42 PM
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cogman Offline
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Posts: 14
Joined: Apr 2011
Post: #13
RE: Help with a loose crank
Sorry to be difficult, but is it just possible just to tighten the bolt on its own without removing the whole crank?
[/quote]

Basically Yes.
But I would remove the bolt and make sure there is a washer under it.
If the crank is loose then it may come off with a tug anyway?
You still need a good socket / tool to tighten the bolt though.
[/quote]



Right, So I tried to tighten the bolt, and it was already tight... so then I thought there must be something inside thats making it wobble, I took it apart to find broken bearing cages!, and a whole load of gunk on some of the parts which I cleaned. Can anyone advise me what to do now? :|

Thanks


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Jul 1, 2011 10:05 AM
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Joe_W Offline
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Posts: 1,177
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Post: #14
RE: Help with a loose crank
Inspect the races for damage (pitting), both the axle and the hub shell. Carefully measure the balls, get replacement loose balls, as they are really cheap, get more than you think you'll need. Follow instructions at http://bicycletutor.com/bottom-bracket/ to reassemble and set up.
Jul 4, 2011 04:24 AM
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Bill Offline
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NY,USA
Posts: 2,766
Joined: Sep 2009
Post: #15
RE: Help with a loose crank
If I could see the type of bike (manufacturer and model) I maybe able to see the parts you need.

Good maintenance to your Bike, can make it like the wheels are, true and smooth!
Jul 4, 2011 07:34 AM
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nfmisso Offline
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San Jose, CA
Posts: 2,332
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Post: #16
RE: Help with a loose crank
note, with loose balls, your will need 20% to 50% more balls than were in the cages (same size balls) which will result in a significant increase in strength and stiffness. My project bikes without a sealed BB get loose balls, no cages. Sheldon Brown has a good discussion on this also. I use grease intended for boat trailer wheel bearings; inexpensive and will last for a very long time.

Nigel
Jul 4, 2011 09:13 AM
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painkiller Offline
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Peoria, IL. USA
Posts: 1,448
Joined: Mar 2011
Post: #17
RE: Help with a loose crank
Chances are the spindle and races are pitted, inspect close. if you want the best quality repair and plan to keep the bike replace it with new spindle and cups or a cartridge style bottom bracket


There are two kinds of people in the world, "Those who help themselves to people, and those who help people!"
Jul 4, 2011 09:39 AM
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nfmisso Offline
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San Jose, CA
Posts: 2,332
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Post: #18
RE: Help with a loose crank
Your safest easiest route is to get one of these:
http://www.amazon.com/Shimano-BB-UN54-Bottom-Bracket-118mm/dp/B000QSUVIC/
make sure you get the right size.

Nigel
Jul 4, 2011 02:08 PM
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